Hailey reportedly wants a monogamous relationship with Biebs.

Justin Bieber recently posted a picture of him kissing American model Hailey Baldwin on his Instagram account.Instagram/Justin Bieber

It was only a few weeks ago that Justin Bieber and model Hailey Baldwin started dating. However, it looks like Biebs' love interest is wary of the singer's past relationships and his bad boy status. The latest news claims that Hailey has asked Biebs to "man up" and "stop stringing her along."

The "Sorry" singer was rumoured to be dating the eldest of the Kardashians, Kourtney, just a few days before he hooked up with Hailey during their vacation at Anguila over New Years. Since then, the two have posted a slew of pictures on their Instagram account, sending a strong message that Biebs has finally found love again. An uncaptioned picture of him kissing Hailey on New Years instantly became one of the most popular photos on Biebs' Instagram account.

The "What Do You Mean" singer was last in a long term relationship with Selena Gomez. After their break up, Justin has been linked with several models and actresses.

A source told US Weekly that Hailey wants Justin to be "monogamous." "Justin has never had a woman act like that before. He couldn't say no. So he's been seeing her again and is with her all the time."

Recently, Justin, 21, and Hailey were seen on a casual lunch date after the model went on a girls night out with model Kendall Jenner and her sister, Kourtney Kardashian, sparking suspicion if the singer indeed dated Kourtney.